I want to understand why some scientists collaborated with the Soviet Union and its atomic program during and after the WWII. What I want to know is if there were some specific characteristics or events that made them more willing to contribute.
Some people have pointed out to ideological sympathy to the Soviets, but I find this hard to believe since not all scientists with socialist ideas helped them. Moreover, some of them feared what the Soviets might do with an atomic bomb.
Why did scientists join the network of Soviet atomic spies?
P.S. Any references that deeply analyzes this or the Rosenberg case, is welcomed!